import Vue from 'vue';
import allScreen from '../assets/icon/allScreen.png'
import ExitallScreen from '../assets/icon/ExitallScreen.png'
/*
 *  定义公共js里，在入口文件main.js中import；
 *  给elementUI的dialog上加上 v-dialogDrag 指令就可以实现弹窗的全屏和拉伸了。
 */
// v-dialogDrag: 弹窗拖拽+水平方向伸缩
Vue.directive('dialogDrag', {
  bind(el, binding, vnode, oldVnode) {
    //弹框可拉伸最小宽高
    let minWidth = 400;
    let minHeight = 300;
    //初始非全屏
    let isFullScreen = false;
    //当前宽高
    let nowWidth = 0;
    let nowHight = 0;
    //当前顶部高度
    let nowMarginTop = 0;
    //获取弹框头部（这部分可双击全屏）
    const dialogHeaderEl = el.querySelector('.el-dialog__header');
    const scaleElement = document.createElement('img');
    scaleElement.src = allScreen
    scaleElement.title = '全屏'
    scaleElement.style.width = '15px'
    scaleElement.style.cursor = 'pointer'
    scaleElement.style.float = 'right';
    scaleElement.style.marginRight = '18px'
    scaleElement.style.marginTop = '1px'
    dialogHeaderEl.appendChild(scaleElement);
    //弹窗
    const dragDom = el.querySelector('.el-dialog');
    dragDom.style.top = '6%';
    // dragDom.style.width = '50%';
    // dragDom.style.MinWidth = "40%";
    dragDom.style.marginTop = '0';
    //给弹窗加上overflow auto；不然缩小时框内的标签可能超出dialog；
    dragDom.style.overflow = "auto";
    //清除选择头部文字效果
    dialogHeaderEl.onselectstart = new Function("return false");  
    //头部加上可拖动cursor
    dialogHeaderEl.style.cursor = 'move';

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);
    // console.log(this)
    // dialogHeaderEl.appendChild(<div>123</div>)

    let moveDown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft;
      const disY = e.clientY - dialogHeaderEl.offsetTop;

      // 获取到的值带px 正则匹配替换
      let styL, styT;

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes('%')) {
        styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100);
        styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100);
      } else {
        styL = +sty.left.replace(/\px/g, '');
        styT = +sty.top.replace(/\px/g, '');
      };

      document.onmousemove = function (e) {
        // 通过事件委托，计算移动的距离 
        const l = e.clientX - disX;
        const t = e.clientY - disY;

        // 移动当前元素  
        dragDom.style.left = `${l + styL}px`;
        dragDom.style.top = `${t + styT}px`;

        //将此时的位置传出去
        //binding.value({x:e.pageX,y:e.pageY})
      };

      document.onmouseup = function (e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    }
    dialogHeaderEl.onmousedown = moveDown;
    //双击头部效果

    scaleElement.onclick = (e) => {
        // console.log(e)
        if (isFullScreen == false) {
          nowHight = dragDom.clientHeight;
          nowWidth = dragDom.clientWidth;
          nowMarginTop = dragDom.style.marginTop;
          dragDom.style.top = '0';
          dragDom.style.left = null;
          dragDom.style.height = "100vh";
          dragDom.style.width = "99vw";
          dragDom.style.marginTop = 0;
          dragDom.style.marginLef = 0;
          isFullScreen = true;
          scaleElement.src = ExitallScreen
          scaleElement.title = '退出全屏'
          dialogHeaderEl.style.cursor = 'initial';
          dialogHeaderEl.onmousedown = null;
        } else {
          dragDom.style.height = "auto";
          dragDom.style.width = nowWidth + 'px';
          dragDom.style.marginTop = nowMarginTop;
          isFullScreen = false;
          dialogHeaderEl.style.cursor = 'move';
          dialogHeaderEl.onmousedown = moveDown;
          scaleElement.src = allScreen
          scaleElement.title = '全屏'


        }
      }

    dialogHeaderEl.ondblclick = (e) => {
      if (isFullScreen == false) {
        nowHight = dragDom.clientHeight;
        nowWidth = dragDom.clientWidth;
        nowMarginTop = dragDom.style.marginTop;
        dragDom.style.left = null;
        dragDom.style.top = 0;
        dragDom.style.height = "100vh";
        dragDom.style.width = "99vw";
        dragDom.style.marginTop = 0;
        dragDom.style.marginLef = 0;
        isFullScreen = true;
        scaleElement.src = ExitallScreen
        scaleElement.title = '退出全屏'
        dialogHeaderEl.style.cursor = 'initial';
        dialogHeaderEl.onmousedown = null;
      } else {
        dragDom.style.height = "auto";
        dragDom.style.width = nowWidth + 'px';
        dragDom.style.marginTop = nowMarginTop;
        isFullScreen = false;
        dialogHeaderEl.style.cursor = 'move';
        dialogHeaderEl.onmousedown = moveDown;
        scaleElement.src = allScreen
        scaleElement.title = '全屏'


      }
    }
    

    //拉伸
    // let resizeEl=document.createElement("div");
    // dragDom.appendChild(resizeEl); 
    // //在弹窗右下角加上一个10-10px的控制块
    // resizeEl.style.cursor = 'se-resize';
    // resizeEl.style.position = 'absolute';
    // resizeEl.style.height = '10px';
    // resizeEl.style.width = '10px';
    // resizeEl.style.right = '0px';
    // resizeEl.style.bottom = '0px';
    // //鼠标拉伸弹窗
    // resizeEl.onmousedown = (e) => {

    //   // 记录初始x位置
    //   const clientX = e.clientX;
    //   // 鼠标按下，计算当前元素距离可视区的距离
    //   const disX = e.clientX - resizeEl.offsetLeft;
    //   const disY = e.clientY - resizeEl.offsetTop;

    //   document.onmousemove = function (e) {
    //     e.preventDefault(); // 移动时禁用默认事件

    //     // 通过事件委托，计算移动的距离 
    //     const x = e.clientX - disX + (e.clientX - clientX);//这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
    //     const y = e.clientY - disY;
    //     //比较是否小于最小宽高
    //     dragDom.style.width = x > minWidth ? `${x}px` : minWidth + 'px';
    //     dragDom.style.height = y > minHeight ? `${y}px` : minHeight + 'px';
    //   };
    //   //拉伸结束
    //   document.onmouseup = function (e) {
    //     document.onmousemove = null;
    //     document.onmouseup = null;
    //   };
    // }
  }
})
/**
 *  注意：如果是el-dialog弹出的表单el-form，最好不要把提交按钮当做el-form-item（elementUI文档是这么用的），放在el-dialog里。
 *  不然按钮会同el-dialog中标签一样被overflow；
*/